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This may be drifting a little away from the passive, but still relevant for the use of the IR eyes.
As observed in another thread the datalink conenctions are shared between the AUX and speakerlink connectors at least in a BM5500.
On the The MCL2A IR data from the IR eye is connected directly to the datalink connection
This made me think, can the IR eye be used connected directly to the datalink pin 6 on the BM5500 AUX connector. So I made a little 7 pin DIN connector with data and ground from the MCL IR eye connected to pin 6 and 2 and a wire to a set of headphones connected to pin 1, 4 and 2. 5V power from a bench supply connected ground and +5V wires of the IR eye.
Setting the IR eye to option 1, and covering the BM5500’s IR eye full control is possible.
I don’t have a BLC 1615 myself (yet), but will try if this is possible with the BLC 1611. Might not work the same way though as the BLC 1611 is not a link room product the same way as the 1615.
Just did a test with the BLC 1611, and that dit work.
The connection between the BLC 1611 AAL connector and the MCL2AV screw terminal is as follows:
BLC1611 pin 2 – > MCL2AV Brown GND R, Grey GND L, Shield GND
BLC1611 pin 1 – > MCl2AV Yellow L
BLC1611 pin 4 – > MCL2AV Green R
BLC 1611 pin 6 – > MCL2AV White Data
The MCL2AV set to option 1,5 for activating the PL connectors. I cannot comment on sound quality as I used a pair of headphones as PL speakers
As audiomaster on the ML side I used my Beoport with no IR eye connected to make sure that the IR signals was from the MCL2AV only.
Now it’s going to be exciting to see if it will also work with the BLC 1615 as that combination could make a ML link room with local datalink inputs
Ok taking it to a deeper level of resarch now. I have tried to open up the BL3500 to try and acces the plug board, but it’s placed beneath several layers, and it seems that the wooferes also has to be removed and they are atteched with a combination of screws and double sided tape, so that has to be for another time.
However that display and IR reciever PCB in the front might give some insights.
The ribbon cable from the PCB contains several signals, so I decided to measure the with my multimeter when the unit was in standby and activated. After that I tried this again but this time with the 1611 converter connected to ML to se if anything was different.
I noticed different results for the connections PMUTE and +5VA St.BY.When the BL3500 was stand alone both would be at 5V in both standby and when activating the BL3500 with and audio command.
However when I connected the 1611 converter both would be 5V in stand by, but drop to 0V when activating with an audio command.
Looking at the Block diagram for system control in the service manual I can see that the PMUTE signals ends in the power amplifiers for left and right respectivly.
So this indicates that when the speaker is not connected to ML it will not unmute the power amplifiers , and therefor not let sound through to the speakers in stand alone mode.
I will try to do the same test with MCL connected one of the coming days to see if this give the same result.
I just aquired a working Beogram 2000 with some cosmetic issues, but none of the less working.
So I had to try it with the 1611 -MCL2AV combo
Setup:
BL3500 -ML – 1611 – datalink – MCL2AV – datalink – BG2000 (connected to CD input)
Control og the BG2000 was fully possible from the BL3500 with the use of CD command.
only issue was that I had to turn the volume to max as I still need a RIAA amplifier.
I noticed different results for the connections PMUTE and +5VA St.BY.
